Added mangleString member and onBefore*, onAfter* functions to GrGLFragmentShaderBuilder

include/core/SkString.h

Index: include/core/SkString.h
diff --git a/include/core/SkString.h b/include/core/SkString.h
index e0a51c6515a59ffb511747e0c16be64f81a74054..ea73e0982389eba2e2fcf050b2485f608ea3c9a9 100644
--- a/include/core/SkString.h
+++ b/include/core/SkString.h
@@ -39,6 +39,12 @@ static int SkStrFind(const char string[], const char substring[]) {
     return SkToS32(first - &string[0]);
 }
 
+static int SkStrFindLastOf(const char string[], const char subchar) {
+    const char* last = strrchr(string, subchar);
+    if (NULL == last) return -1;
+    return SkToS32(last - &string[0]);
+}
+
 static bool SkStrContains(const char string[], const char substring[]) {
     SkASSERT(string);
     SkASSERT(substring);
@@ -152,6 +158,9 @@ public:
     int find(const char substring[]) const {
         return SkStrFind(fRec->data(), substring);
     }
+    int findLastOf(const char subchar) const {
+        return SkStrFindLastOf(fRec->data(), subchar);
+    }
 
     friend bool operator==(const SkString& a, const SkString& b) {
         return a.equals(b);